6820862549 has 4 divisors (see below), whose sum is σ = 6866640300. Its totient is φ = 6775084800.

The previous prime is 6820862491. The next prime is 6820862579. The reversal of 6820862549 is 9452680286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2182571524 + 4638291025 = 46718^2 + 68105^2 .

It is a cyclic number.

It is not a de Polignac number, because 6820862549 - 2¹² = 6820858453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6820862497 and 6820862506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6820862579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22888652 + ... + 22888949.

It is an arithmetic number, because the mean of its divisors is an integer number (1716660075).

Almost surely, 2^6820862549 is an apocalyptic number.

It is an amenable number.

6820862549 is a deficient number, since it is larger than the sum of its proper divisors (45777751).

6820862549 is a wasteful number, since it uses less digits than its factorization.

6820862549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45777750.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 6820862549 is about 82588.5134204509. The cubic root of 6820862549 is about 1896.4719894570.

The spelling of 6820862549 in words is "six billion, eight hundred twenty million, eight hundred sixty-two thousand, five hundred forty-nine".